EP1216305A1 - Souche de lactobacillus delbrueckii et son utilisation pour le criblage de plasmides - Google Patents
Souche de lactobacillus delbrueckii et son utilisation pour le criblage de plasmidesInfo
- Publication number
- EP1216305A1 EP1216305A1 EP00964296A EP00964296A EP1216305A1 EP 1216305 A1 EP1216305 A1 EP 1216305A1 EP 00964296 A EP00964296 A EP 00964296A EP 00964296 A EP00964296 A EP 00964296A EP 1216305 A1 EP1216305 A1 EP 1216305A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plasmid
- derivatives
- plasmids
- strain
- delbrueckii
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/74—Vectors or expression systems specially adapted for prokaryotic hosts other than E. coli, e.g. Lactobacillus, Micromonospora
- C12N15/746—Vectors or expression systems specially adapted for prokaryotic hosts other than E. coli, e.g. Lactobacillus, Micromonospora for lactic acid bacteria (Streptococcus; Lactococcus; Lactobacillus; Pediococcus; Enterococcus; Leuconostoc; Propionibacterium; Bifidobacterium; Sporolactobacillus)
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
- C12N1/205—Bacterial isolates
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12R—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C12C - C12Q, RELATING TO MICROORGANISMS
- C12R2001/00—Microorganisms ; Processes using microorganisms
- C12R2001/01—Bacteria or Actinomycetales ; using bacteria or Actinomycetales
- C12R2001/225—Lactobacillus
Definitions
- the present invention relates to the introduction of plasmids into Lactobacillus delbruecku.
- LANGELLA and CHOPIN [FEMS Microbiol. Lett. , 51, 149-52, (1989)] described the introduction by conjugation of foreign DNA (conjugative plasmid pIP501 from Streptococcus agalactiae) in Lb. delbruckii subsp. bulgaricus; PCT Application
- WO 93/18164 describes the introduction to Lb. delbruckii subsp. bulgari cus of plasmids which comprise the replication system of the mutant replicon pVE6002 (CNCM 1-1179) also called pG + host, thermosensitive derivative (Ts) of the plasmid pWVO1;
- Application EP 0603416 in the name of MEIJI MILK PRODUCTS CO LTD describes the use of the plasmid conjugative pAM ⁇ 1 to integrate a heterologous gene into the Lb chromosome. delbruckii. BOIZET et al. [Appl. About. Microbiol.
- delbrueckii by electroporation using plasmids derived from pBUL1, or from the plasmid pSYE originating from Lactococcus lactis; 1 electroporation is performed after an intermediate Lb culture step.
- delbrueckii at 42 ° C for 2 to 3 hours in an LCMG medium whose initial pH is between 5 and 5.5 and containing formic acid (5 to 5.5 mg / ml). This step is followed by washing and heat treatment at temperatures ranging from 0 to 50 ° C, for 10 minutes to 24 hours.
- SASAKI et al. Electrotransformation of Lactobacillus delbrueckii subsp. bulgaricus; FEMS Microbiol. Rev.
- Lb strains. delbrueckii more easily transformable, in order to use them as hosts allowing the replication and the expression of foreign DNA, as well as as models, to test plasmids in order to then use them to transform other strains of Lb. delbrueckii, especially industrial strains.
- a single strain of Lb. bulgaricus is currently known to allow high transformation rates using plasmid DNA whose preparation was not carried out from Lb. delbrueckii; it is the mutant strain T-ll mentioned above, which is deficient in a restriction / modification system.
- Such a strain does not, however, constitute a good model for testing plasmids intended to be introduced into strains having an intact restriction / modification system.
- the inventors have succeeded in obtaining, from a representative strain of Lb. delbrueckii subsp. bulgaricus, strain ATCC11842, a mutant strain whose restriction / modification systems appear similar to those of the wild strain ATCC11842 and which can be transformed much more easily and in a more reproducible manner than the latter.
- the use of this mutant strain enabled them to identify plasmids that could potentially be used to transform Lb. delbrueckii.
- the present invention relates to the Lb strain. delbrueckii subsp. bulgaricus, hereinafter referred to as VI104, deposited under the Budapest Treaty on September 17, 1999, under number 1-2316, with the CNCM (National Collection of Cultures of Microorganisms), 25 rue du Dondel Roux, in Paris.
- VI104 Lb strain. delbrueckii subsp. bulgaricus
- the present invention also relates to a method for screening for plasmids capable of transforming bacteria of the Lb species. delbrueckii, characterized in that one proceeds to 1 electroporation of the strain VI104 in the presence of a plasmid to be tested, and to the detection of transformed bacteria.
- the plasmid in transformed bacteria, can be present in free form, in the case of a replicative plasmid, or in integrated form in the case of an integrative plasmid.
- copies of said plasmid can be recovered from said transformed bacteria, in order to be used to transform VI104 or other strains of Lb. delbrueckii, in particular strains whose restriction systems are barriers to transformation.
- strain VI104 can be carried out according to techniques known from the prior art for the electroporation of Lb. delbrueckii, for example that described in Application JP 5-176777.
- the inventors have observed that a better transformation yield is obtained if the intermediate stage of culture used in this method is omitted, and if the electroporation is carried out on cultures at the start of the stationary phase, and after a heat treatment at 45 ° C between 10 and 30 min.
- the present invention also relates to the use of a plasmid capable of being selected by the above method, with the exception of the plasmid pBUL1 described in Application EP 529088 and its derivatives, heat-sensitive derivatives of the plasmid pWVOl , containing the mutant replicon pVE6002, described in PCT Application WO 93/18164, and the plasmid pSYE described in Application JP 5-176777 and its derivatives, for transforming a bacterium of the Lb species. delbrueckii.
- said plasmid is chosen from: the plasmid pWS58 and its derivatives; - the plasmid pLEM7 and its derivatives; the plasmid pLP1 and its derivatives; the plasmid pLC2 and its derivatives; the plasmid pGT633 and its derivatives; the plasmid pWVO1 and its derivatives, with the exception of the heat-sensitive derivatives containing the mutant replicon pVE6002; the plasmid pSH71 and its derivatives; non-conjugative plasmids derived from pIP501; non-conjugative plasmids derived from pAM ⁇ l - the integrative plasmid pMCl and its derivatives.
- plasmid derived from a plasmid X means any plasmid which can be obtained from said plasmid X by insertion and / or deletion of a nucleotide sequence and / or mutation (s) of the initial sequence, provided that said plasmid retains functional elements allowing its replication at Lb. delbrueckii. These functional elements can be identical to those of the initial plasmid, or they can differ from these by the introduction of mutation (s), in particular of mutation (s) leading to a conditional activity of the replication and / or stability functions.
- Plasmids derived from a plasmid X can also be obtained, for example, by insertion into said plasmid X of one or more sequences such as genes of interest which it is desired to express in the host bacterium transformed by said plasmid , multisite linkers allowing the insertion of said genes, transcription and / or translation control sequences, reporter genes, selection markers and in particular markers compatible with food use, mobile elements, chromosomal fragments (s) or plasmid (s), sequences controlling the number of copies of the plasmid. These sequences can be inserted in addition to plasmid sequences already present, or in replacement of some of them. Derived plasmids which can be used as shuttle vectors can also be constructed by inserting sequences making it possible to broaden the host spectrum, in particular sequences allowing replication and maintenance in host bacteria belonging to other species.
- the plasmids selected in accordance with the invention can advantageously be used to test whether a given nucleotide sequence (gene, control sequence, mobile element, etc.) is functional in Lb. delbrueckii.
- Table I below shows that the strains ATCC11842 and VT104 restrict in an equivalent manner 3 phages (C5h2, C5, 11) propagated on the strains CNRZ448 or CNRZ327.
- the VI104 bacteria are grown in MRS medium, 0.1% glycine (DIFCO) until the start of the stationary phase. They are then centrifuged and washed in electroporation buffer (0.4 M sucrose, 1 raM MgCl 2 , 5 mM KH 2 P0 4 , pH 6.0) and suspended in this same buffer at a concentration corresponding to a OD 50 of approximately 50. The suspension is incubated for 20 min at 45 ° C. and then cooled on ice. An 80 ⁇ l aliquot of the suspension is mixed with the plasmid DNA (-1.5 ⁇ g) and the mixture is transferred to a 0.2 cm electroporation tank. The electroporation is carried out at 1 kV, 800 ⁇ , and 25 ⁇ F.
- electroporation buffer 0.4 M sucrose, 1 raM MgCl 2 , 5 mM KH 2 P0 4 , pH 6.0
- the mixture is diluted in 2 ml of expression medium (0.2 M sucrose, 5% skimmed milk powder, 0.1% yeast extract, 1% casamino acids, 25 mM MgCl 2 ).
- expression medium 0.2 M sucrose, 5% skimmed milk powder, 0.1% yeast extract, 1% casamino acids, 25 mM MgCl 2 .
- the cells are spread on dishes of selective medium (MRS Agar with 10 ⁇ g / ml of erythromycin or 10 ⁇ g / ml of chloramphenicol according to the selection marker carried by the plasmid to test) ; the dishes are incubated in an anaerobic jar at 37 ° C. for 48 h, and the colonies resistant to erythromycin or to chloramphenicol are selected to confirm the presence of plasmid DNA.
- VI104 The transformation of VI104 with different types of plasmids was carried out according to the protocol described in Example 2 above.
- Figure 1 Results of the electrophoretic analysis of total DNA of transformants of L. bulgaricus VI104.
- Total DNA was prepared from the transformants of pJK650 (A), pLEM415 (B) and pGT633 (C).
- wells 1 and 2 correspond, respectively, to the plasmid DNA representative of that used during the transformation and to the total DNA of a transformant.
- Figure 2 Results of total DNA analysis of an L transformant. bulgaricus VI104 by pULP8.
- Wells 1 and 2 correspond, respectively, to the electrophoretic analysis of the plasmid DNA representative of that used during the transformation and to the total DNA of a transformant.
- Wells 4 and 5 correspond, respectively, to the hybridization of a pULP8 probe against the plasmid DNA representative of that used during the transformation and against the total DNA of a transformant after digestion with the enzyme .EcoRI.
- Figure 3 Hybridization results of total DNA of L transformants. bulgaricus VI104 by pCU1882.
- Total DNA was prepared from the transformants of pCU1882.
- Wells 1 and 3 contain the plasmid DNA representative of that used during the transformation and wells 2 and 4 contain the total DNA of a transformant.
- the DNA is in native form in wells 1 and 2, and digested with the enzyme SalI in wells 3 and 4.
- the probe used is pCU1882.
- Figure 4 Results of hybridization of the total DNA of two L transformants. bulgaricus VI104 by pNZ12.
- Wells 1 and 4 contain the plasmid DNA representative of that used during the transformation and wells 2, 3, 5 and 6 contain the total DNA of the transformants.
- the DNA is in native form in wells 1 to 3, and digested with the enzyme Nco I in wells 4 to 6.
- the probe used is pNZ12.
- Plasmid of homologous origin The plasmid pJK650 (8.96 kb, KLEIN et al.,
- Rolling circle replication plasmids. Different plasmids derived from replicons
- transformants were obtained with the following plasmids: - pLEM7 [FONS et al. , Plasmid, 37, 199-203,
- the plasmid pGT633 (9.8 kb), isolated from Lactobacillus reuteri, is naturally Ery R [TANNOCK et al. , Plasmid., 31, 60-71, (1994)]. Analysis of transformants allowed the detection of free molecules (Fig. 1C).
- - pIL253 (Ery R ), is a non-conjugative derivative of pAM ⁇ 1 [SIMON and CHOPIN, Biochemistry, 70, 559-566, (1988)]. Several transformants were obtained with VI104. Plasmid DNA extraction detects free plasmid with low copy numbers.
- the plasmid pMCl contains the attachment site attP (overlapping the tRNA ser gene) and the integrase gene (int) of the bacteriophage mv4 of L. delbrueckii [DUPONT et al. , J. Bacteriol. , 177, 586-595,
- This vector integrates into the tRNA ser gene of a wide variety of lactic acid bacteria such as L. plantarum, L. casei, L. lactis, E. faecalis and Streptococcus pneumonia [AUVRAY et al. , J. Bacteriol., 179, 1837-1845, (1997)]. With VI104, integrants are obtained; structural analysis of their chromosomal DNA shows that pMCl integrates specifically.
- EXAMPLE 4 TRANSFORMATION OF OTHER STRAINS OF L. DELBRUECKII.
- transformants of pJK650 and pGB305 ⁇ are obtained with the strains ATCC11842 and CNRZ327
- transformants of pLEM415 are obtained with the strain CNRZ327.
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- Health & Medical Sciences (AREA)
- Genetics & Genomics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biotechnology (AREA)
- Zoology (AREA)
- Wood Science & Technology (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Biomedical Technology (AREA)
- General Engineering & Computer Science (AREA)
- Microbiology (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Plant Pathology (AREA)
- Molecular Biology (AREA)
- Biophysics (AREA)
- Physics & Mathematics (AREA)
- Medicinal Chemistry (AREA)
- Tropical Medicine & Parasitology (AREA)
- Virology (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9911683A FR2798669B1 (fr) | 1999-09-17 | 1999-09-17 | Souche de lactobacillus delbrueckii et son utilisation pour le criblage de plasmides |
| FR9911683 | 1999-09-17 | ||
| PCT/FR2000/002564 WO2001021818A1 (fr) | 1999-09-17 | 2000-09-15 | Souche de lactobacillus delbrueckii et son utilisation pour le criblage de plasmides |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1216305A1 true EP1216305A1 (fr) | 2002-06-26 |
| EP1216305B1 EP1216305B1 (fr) | 2008-07-30 |
Family
ID=9549995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00964296A Expired - Lifetime EP1216305B1 (fr) | 1999-09-17 | 2000-09-15 | Souche de lactobacillus delbrueckii et son utilisation pour le criblage de plasmides |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP1216305B1 (fr) |
| AT (1) | ATE403003T1 (fr) |
| AU (1) | AU7526400A (fr) |
| DE (1) | DE60039703D1 (fr) |
| DK (1) | DK1216305T3 (fr) |
| ES (1) | ES2311471T3 (fr) |
| FR (1) | FR2798669B1 (fr) |
| WO (1) | WO2001021818A1 (fr) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI77056C (fi) * | 1986-06-24 | 1989-01-10 | Valio Meijerien | Vektorplasmid som laempar sig foer syrningsmedel, speciellt foer mejerisyrningsmedel. |
| JP3294288B2 (ja) * | 1991-02-22 | 2002-06-24 | 明治乳業株式会社 | 乳酸桿菌由来の新規なプラスミドpBUL1 及びその誘導体 |
| JPH05176777A (ja) * | 1991-12-27 | 1993-07-20 | Meiji Milk Prod Co Ltd | ラクトバチルス属乳酸桿菌の形質転換方法 及びその形質転換体 |
| FR2688515B1 (fr) * | 1992-03-13 | 1995-03-31 | Institut Rech Agronomique | Plasmide thermosensible. |
| JP2931939B2 (ja) * | 1992-07-10 | 1999-08-09 | 明治乳業株式会社 | Lactobacillus delbrueckii 種染色体への遺伝子組込み方法及び遺伝子組込み体 |
-
1999
- 1999-09-17 FR FR9911683A patent/FR2798669B1/fr not_active Expired - Fee Related
-
2000
- 2000-09-15 EP EP00964296A patent/EP1216305B1/fr not_active Expired - Lifetime
- 2000-09-15 DK DK00964296T patent/DK1216305T3/da active
- 2000-09-15 WO PCT/FR2000/002564 patent/WO2001021818A1/fr not_active Ceased
- 2000-09-15 AU AU75264/00A patent/AU7526400A/en not_active Abandoned
- 2000-09-15 AT AT00964296T patent/ATE403003T1/de not_active IP Right Cessation
- 2000-09-15 DE DE60039703T patent/DE60039703D1/de not_active Expired - Lifetime
- 2000-09-15 ES ES00964296T patent/ES2311471T3/es not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0121818A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE60039703D1 (de) | 2008-09-11 |
| WO2001021818A1 (fr) | 2001-03-29 |
| ATE403003T1 (de) | 2008-08-15 |
| EP1216305B1 (fr) | 2008-07-30 |
| ES2311471T3 (es) | 2009-02-16 |
| FR2798669A1 (fr) | 2001-03-23 |
| AU7526400A (en) | 2001-04-24 |
| FR2798669B1 (fr) | 2004-02-20 |
| DK1216305T3 (da) | 2008-12-01 |
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